Concept

Round Island Passage Light

Summary
Round Island Passage Light is an automated, unmanned lighthouse located in the Round Island Channel in the Straits of Mackinac, Michigan. The channel is a branch of Lake Huron. History The Round Island Lighthouse was constructed in 1895 to mark the southern side of the Round Island Channel. In 1936, the United States Coast Guard developed plans to construct another lighthouse, 1000 feet south of Mackinac Island, to mark the northern side of the navigable channel. However, World War II intervened, and construction was delayed. In the interim, a buoy with a radio beacon was moored near the site. The Coast Guard began construction on the Round Island Passage Light in 1947, and finished in 1948. Construction included building a control house at the southern tip on Mackinac Island, and running power cables underwater to the light. The lighthouse was equipped with a beacon light, fog signal, and radiobeacon. The light flashed a green signal from an array of sealed beam lamps mounte
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